A manufacturing method of straight down backlight LED light strip

As LED has the characteristics of energy saving, environmental protection, long service life and high luminous efficiency, at present, LCD backlight basically adopts LED backlight. LED backlight is divided into side entry type and straight down type; The straight down type means that the light guide plate is not required, and the LED bulb array is placed on the back plate. The light emitted from the LED bulb is reflected through the bottom and side, and then evenly emitted through the diffusion plate and optical module on the surface.

At present, the straight down backlight generally adopts the form of LED lamp beads welded on the PCB board, and a lens is placed above the LED lamp beads to increase the luminous angle; Led beads and lenses match each other. The main parameters related to the matching of LED bulb and lens are the total height of bulb, the height of bulb bowl and cup and the luminous surface of bulb. These three parameters are determined by the LED support. At present, the LED brackets of different bracket manufacturers are different, which leads to different LED beads need to develop different lenses, with high cost and long development cycle; At the same time, after mass production, it is difficult to control materials and purchase, which is not conducive to production and inventory management.

In order to solve the shortcomings of the prior art, the utility model provides a straight down backlight LED light strip, which can make the LED beads of different supports use the same lens, so as to avoid the problems of large cost, long development cycle and difficult control caused by the development of different types of lenses.

The utility model has the following advantages:

1. A reflective layer is arranged on the LED support, and the effective luminous surface of the LED chip is formed through the hole shaped luminous surface opened in the reflective layer, so as to realize the adjustable effective luminous surface of the LED lamp bead;

2. The reflective layer is provided with a hole-shaped luminous surface, and the opening height of the hole-shaped luminous surface and the opening depth of the concave surface of the LED support form the cup height of the LED lamp bead. By adjusting the height of the reflective layer, the height of the LED lamp bead bowl can be adjusted;

3. Thin substrates with different thicknesses or other welding materials are added between the LED lamp beads and the PCB board. The increased thickness of welding materials, the thickness of LED support and the thickness of reflective layer constitute the total height of LED lamp beads. The total height of LED lamp beads can be adjusted by adjusting the thickness of reflective layer and welding materials;

4. By adjusting the height of the reflective layer, the thickness of the welding material and the porous light-emitting surface, different types of LED supports can achieve the same total height of LED beads, bowl height and light-emitting surface, so as to achieve the same optical effect, so that different types of LED supports can use the same lens, avoiding the need to develop different types of lenses when using different types of LED supports, which is conducive to reducing the development cost and shortening the development cycle of the overall project, At the same time, it is conducive to reduce production costs and facilitate mass production management and control.